[Linux] The Texture widget causes crash in multi-window environment

[Kingtous]

The Texture widget cannot run in the sub window, which will easily cause crash on Linux (not every time). Seems there's some data-race problems with multiple windows which has a flutter engine individually.

The Texture widget can run in the main window without any errors.

Reproduce Steps

Steps to reproduce the behavior:

1. Go to 'rustdesk_desktop_multi_window/example', compile and run
2. Click on 'create sub window'
3. See error

Expected behavior

A texture window is opened without any errors.

Version (please complete the following information):

• Flutter Version: v3.7.2
• OS: Linux